WO2013118657A1 - Pneumatique - Google Patents

Pneumatique Download PDF

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Publication number
WO2013118657A1
WO2013118657A1 PCT/JP2013/052401 JP2013052401W WO2013118657A1 WO 2013118657 A1 WO2013118657 A1 WO 2013118657A1 JP 2013052401 W JP2013052401 W JP 2013052401W WO 2013118657 A1 WO2013118657 A1 WO 2013118657A1
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WO
WIPO (PCT)
Prior art keywords
tire
indicator
sidewear
opening edge
recess
Prior art date
Application number
PCT/JP2013/052401
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English (en)
Japanese (ja)
Inventor
晋平 小嶋
Original Assignee
株式会社ブリヂストン
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Filing date
Publication date
Application filed by 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Publication of WO2013118657A1 publication Critical patent/WO2013118657A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
    • B60C13/02—Arrangement of grooves or ribs

Definitions

  • the present invention relates to a pneumatic tire.
  • Some of the sidewalls of pneumatic tires used for large vehicles such as trucks and buses are provided with recesses indicating the worn state of the sidewalls that have been worn away by contact with the curb.
  • Japanese Patent Application Laid-Open No. 4-129808 discloses a pneumatic tire in which the opening of the concave portion has a ring shape.
  • the present invention is intended to suppress the concentration of strain in the recesses formed in the sidewall portion of the tire in consideration of the above matters.
  • the pneumatic tire according to the first aspect of the present invention is a pneumatic tire that is formed in a sidewall portion that connects a tread and a bead portion, and has a recess that indicates a worn state of the sidewall portion, from the surface of the tread. Assuming that the height to the tip of the bead portion is H, the concave portion has a height of 0.2H from the maximum position of the tire to the bead portion side from the maximum tire width portion to the tread side of the tire maximum width portion.
  • the radius of curvature of the opening edge formed on the tire side portion that is the region up to the position and located on the tire radial direction side of the recess is larger than the curvature radius of the opening edge located on the tire circumferential direction side, and
  • the radius of curvature of the opening edge located on the tire radial direction side is 10 mm or more.
  • the present invention has the above-described configuration, it is possible to suppress the strain from being concentrated in the concave portion formed in the sidewall portion of the tire.
  • FIG. 1 is a side view of a pneumatic tire according to a first embodiment of the present invention. It is a principal part enlarged view which shows the sideware indicator which concerns on 1st Embodiment of this invention.
  • FIG. 3B is a cross-sectional view taken along the line BB of FIG. 3A, showing the sidewear indicator according to the first embodiment of the present invention. It is a principal part enlarged view which shows the sideware indicator which concerns on 2nd Embodiment of this invention.
  • FIG. 4B is a cross-sectional view taken along the line BB of FIG.
  • FIG. 4A showing the side wear indicator according to the second embodiment of the present invention. It is a principal part enlarged view which shows the sideware indicator which concerns on 3rd Embodiment of this invention.
  • FIG. 6B is a cross-sectional view taken along the line BB of FIG. 6A showing the sidewear indicator according to the third embodiment of the present invention. It is a table
  • surface which shows the test result of the pneumatic tire which concerns on an Example, and the pneumatic tire of a comparative example. It is a graph which shows the relationship between the curvature radius of the side wear indicator of a tire radial direction, and main distortion. It is a side view which shows the state where the load is applied to the pneumatic tire in which the sidewear indicator of the comparative example was formed, and it is rolling.
  • the pneumatic tire 10 according to the first embodiment of the present invention will be described with reference to FIGS.
  • the arrow W indicates the width direction of the pneumatic tire 10
  • the arrow R indicates the radial direction of the pneumatic tire 10
  • the arrow C indicates the circumferential direction of the pneumatic tire 10.
  • Reference sign CL indicates the equator plane of the pneumatic tire 10.
  • the pneumatic tire 10 is a heavy duty tire mainly used for trucks and buses.
  • the tire 10 includes a pair of left and right bead portions 12 (in FIG. 1, only one bead portion 12 is illustrated), a pair of bead cores 14 embedded in each of the pair of bead portions 12, and a pair of bead cores. 14, a carcass layer 16 extending in a toroidal shape, a belt layer 18 provided radially outward of the tire 10 from the carcass layer 16, and a tread portion 20 formed radially outward of the tire 10 from the belt layer 18 And a sidewall portion 22 that connects the bead portion 12 and the tread portion 20.
  • the carcass layer 16 is constituted by one carcass ply as an example, but may be constituted by a plurality of carcass plies.
  • the carcass ply is formed by coating a plurality of cords such as an organic fiber cord and a metal cord with a covering rubber, for example. Further, the end portion of the carcass layer 16 is folded around the bead core 14 from the inside to the outside of the tire 10.
  • the belt layer 18 is constituted by a plurality of belt plies as an example, but may be constituted by a single belt ply.
  • the belt ply is formed, for example, by covering a plurality of cords such as organic fiber cords and metal cords with a covering rubber.
  • a plurality of circumferential grooves 24 extending in the circumferential direction of the tire 10 are formed in the tread portion 20.
  • the tread portion 20 is formed with a plurality of width direction grooves (not shown) extending in a direction intersecting the circumferential direction.
  • the side wall part 22 is formed with a side wear indicator 26 as a concave part recessed toward the inside of the tire 10.
  • the shape of the opening edge 26 ⁇ / b> B of the sidewear indicator 26 is an oval shape having a straight line and a semicircle (see FIG. 2), and the depth of the sidewear indicator 26 is formed so as not to reach the carcass layer 16. Yes. In this embodiment, the depth is 5.5 mm as an example.
  • the side wear indicator 26 indicates the wear state of the tire side portion 30, and the degree of wear of the sidewall portion 22 can be grasped by looking at the depth from the opening surface of the side wear indicator 26 to the bottom portion 26 ⁇ / b> A. it can.
  • the tire side portion 30 in which the side wear indicator 26 is formed has a maximum tire width that is located on the outermost side in the width direction of the tire 10, where H is the height from the surface of the tread 20 to the tip of the bead portion 12.
  • H is the height from the surface of the tread 20 to the tip of the bead portion 12.
  • the range of the tire side portion 30 is statistically determined by the height of the curb, the wear generation region of the tire 10 that is worn at the construction site, and the like, and the wear particularly progresses in the sidewall portion 22. Easy site.
  • the height from the surface of the tread 20 to the tip of the bead portion 12 (tire section height H) can be obtained by the equation (tire diameter ⁇ rim diameter) / 2.
  • the rim is a standard rim of a compliant standard.
  • an intersection point between an extension line extending in the tire width direction from an end portion of the belt ply 18 ⁇ / b> A located on the innermost side in the tire radial direction and the sidewall portion 22 is an intersection K.
  • the side wear indicator 26 is preferably open in a region T from the tire maximum width portion M to the intersection K. In this embodiment, the side wear indicator 26 is formed on the tire maximum width portion M side in the region T. However, the present invention is not limited to this, and the side wear indicator 26 may be formed in another region.
  • each side wear indicator 26 has an opening area of 176.7 mm 2 . If the opening area is smaller than 100 mm 2 , the visibility is deteriorated when the tire is dirty. If the opening area is larger than 1300 mm 2 , the bottom 26A of the sidewear indicator 26 is easily damaged, and the carcass layer 16 may be exposed. There is. For this reason, it is preferable to form the opening area to be 100 mm 2 or more and 1300 mm 2 or less.
  • the shape of the opening edge 26B located in the region A on the reference line XL side from DL2 is formed linearly.
  • the linear length is 15 mm (see FIG. 6).
  • the shape of the opening edge 26B located in the tire circumferential direction side of the sidewear indicator 26 is connected to the opening edge 26 on the tire radial direction side formed in a straight line by a relaxation curve, and is formed in a semicircular shape. Yes. Thereby, distortion is not concentrated on a specific part of the side wear indicator 26. In this embodiment, it is formed in a semicircular shape with a radius of 7.5 mm (see FIG. 6).
  • the side wear indicator 26 is chamfered over the entire circumference of the opening edge 26B. For this reason, it can suppress that stress concentrates on the opening edge 26B and a crack generate
  • the bottom portion 26A of the side wear indicator 26 is formed in a plane.
  • the bottom 26A is formed with a size of 11 mm in the tire circumferential direction and 3 mm in the tire radial direction (see FIG. 6).
  • the sidewall portion 22 is formed from a plurality of curved surfaces. Therefore, the plane referred to here includes a mode in which the inner pressure is filled and the bottom portion 26A is a curved surface.
  • the side wear indicator 26 according to the present embodiment is formed on the tire side portion 30 that is most worn when the sidewall portion 22 contacts the curbstone. Further, the sidewall portion 22 is preferably formed in the region T. Thereby, the wear limit of the sidewall portion 22 can be accurately grasped by looking at the depth of the side wear indicator 26. That is, there is no mistake in the tire 10 replacement time.
  • the bottom portion 26A of the sidewear indicator 26 is formed in a flat surface, even if the sidewall portion 22 is worn to the vicinity of the bottom portion 26A and the depth of the sidewear indicator 26 becomes shallow, a certain opening area is secured. it can.
  • the strain acting on the bottom portion 26A of the sidewear indicator 26 is affected by the boundary between the bottom portion 26A and the inner wall. The risk of cracks occurring can be reduced by being distributed to the part.
  • four sidewear indicators 26 are formed at equal intervals in the tire circumferential direction, and therefore the wear amount of the sidewall portion 22 can be determined by looking at the depth of each sidewear indicator 26. Can be grasped.
  • the shape of the opening edge 26B located on the tire radial direction side of the sidewear indicator 26 when the tire 10 filled with the internal pressure is unloaded is linear.
  • the deformation in the tire circumferential direction is larger than the deformation in the tire radial direction, so that distortion tends to concentrate on the opening edge 26B located on the tire radial direction side.
  • the shape of the opening edge 26B positioned on the tire radial direction side is a straight line, it is possible to suppress the concentration of strain on the opening edge 26B positioned on the tire radial direction side.
  • the shape of the opening edge 26B in the region A of the sidewear indicator 26 By forming a straight line, it is possible to disperse strain in the tire circumferential direction and suppress the occurrence of cracks.
  • the curvature radius of the opening edge 26B of the side wear indicator 26 in the region A is 10 mm or more, the distortion acting on the side wear indicator 26 can be dispersed.
  • the center portion of the sidewear indicator 102 is obtained. Demonstrate that strain is concentrated in a range of ⁇ 45 degrees with respect to a reference line XL passing through P.
  • the main strain refers to the largest tensile strain among strains acting on the sidewear indicator 102.
  • An arrow G in the figure indicates the rolling direction of the tire 100.
  • the tire 100 shown in FIGS. 8A and 9A has the same structure as that of the tire 10 according to the present embodiment, and four sidewall wear indicators 102 are formed at equal intervals in the tire circumferential direction on the sidewall portion 104 of the tire 100.
  • the size of the tire 100 is 275 / 70R22.5, and the internal pressure is set to 900 kPa.
  • a load of 3150 kgf (30.9 kN) was applied to the tire 100, the deformation state of the sidewear indicator 102 when the tire 100 rolled from the position of FIG. 8A to the position of FIG. 9A was observed.
  • the contact portion of the tire 100 is deformed so as to spread along the road surface 106 in the forward and backward directions of the tire 100.
  • the side wear indicator 102 located at 25 degrees opposite to the rotation direction with respect to the straight line YL passing through the center O of the tire 100 and perpendicular to the road surface Along with the deformation of 104, distortion acts in the direction indicated by the arrow in FIG. 8B.
  • the radius of curvature of the portion M1 located on the tire circumferential direction side of the opening edge 102A of the side wear indicator 102 is reduced, and conversely on the tire radial direction side of the opening edge 102A.
  • the radius of curvature of the position M2 is increased. That is, the deformation of the side wear indicator 102 on the tire circumferential direction side is larger, and the side wear indicator 102 is deformed into an elliptical shape.
  • FIG. 9A shows a state in which the sidewear indicator 102 has moved to a position of 25 degrees in the rotational direction with respect to the straight line YL.
  • the side wear indicator 102 is deformed into an elliptical shape as described above due to the stress acting in the direction shown by the arrow in FIG.
  • the radius of curvature of the portion M1 located on the tire circumferential direction side is reduced, and conversely, the radius of curvature of the portion M2 located on the tire radial side is increased.
  • the horizontal axis of FIG. 10 shows the rolling position of the sidewear indicator 102 as an angle, and the angle is between the straight line XL connecting the center O and the center of the sidewear indicator 102 and the straight line YL. Is an angle.
  • the vertical axis indicates the magnitude of the main strain due to the stress acting on the sidewear indicator 102 and the direction of the main strain with respect to the straight line XL.
  • Curve S is the result of plotting the direction of the main strain relative to the tire radial direction at the rolling position of the sidewear indicator 102, and the curve T is at the rolling position of the sidewear indicator 102.
  • the main strain is plotted and connected.
  • the curve T indicating the magnitude of the main strain acting on the sidewear indicator 102 causes the tire 100 to roll from the rolling position ( ⁇ 25 degrees) of the sidewear indicator 102 of FIG. 8A.
  • the main strain is about 12%.
  • the curve S indicating the direction of the main strain acting on the sidewear indicator 102 in this state is in the range of 40 degrees to 45 degrees (area U1 surrounded by a chain line).
  • the main strain has been changed from 11% to 13%, and when the rolling position of the sidewear indicator 102 approaches 12 degrees, the main strain has dropped to 11% or less. Further, the direction of the main strain acting on the sidewear indicator 102 at this time is in the range of ⁇ 40 degrees to ⁇ 45 degrees (region U2 surrounded by a chain line). From the above, it has been found that the distortion acting on the sidewear indicator 102 becomes large when the rolling position of the sidewear indicator 102 is in the range of ⁇ 12 degrees to 12 degrees. Further, it has been found that the main strain becomes particularly large in a range of ⁇ 45 degrees with respect to the tire radial direction of the sidewear indicator 102.
  • the side wear indicator 52 is open to the tire side portion 30 in the same manner as the side wear indicator 26 according to the first embodiment (see FIG. 1). Moreover, the opening edge 52B of the sidewear indicator 52 is formed in the ellipse shape long in a tire circumferential direction, as shown to FIG. 4A. In the present embodiment, the length of the opening edge 52B in the tire circumferential direction is 30 mm, and the length in the tire radial direction is 15 mm (see FIG. 6). Further, the depth is 5.5 mm as in the first embodiment.
  • a straight line in the tire radial direction passing through the center portion P of the opening surface of the sidewear indicator 52 is defined as a reference line XL
  • the reference lines XL1 and DL2 are referenced from the boundary lines DL1 and DL2 inclined by ⁇ 45 degrees around the center portion P from the reference line XL.
  • the curvature radius of the opening edge 52B in the region E on the line XL side is larger than the curvature radius of the opening edge 52B in the tire radial direction and is formed to be 10 mm or more. In this embodiment, it is 20 mm as an example.
  • the opening edge 52B in the tire circumferential direction of the sidewear indicator 52 has a shape in which the opening edge 52B of the region E is connected by a relaxation curve, so that strain is not concentrated on a specific part of the sidewear indicator 52. ing.
  • the bottom 52A of the sidewear indicator 52 is formed in a plane.
  • the bottom 52A is formed with a size of about 16.5 mm in the tire circumferential direction and about 3 mm in the tire radial direction (see FIG. 6).
  • the opening edge 52A of the sidewear indicator 52 is chamfered over the entire circumference.
  • the radius of curvature of the opening edge 52B in the region E of the side wear indicator 52 formed on the pneumatic tire 50 is larger than the curvature radius of the opening edge 52B located on the tire circumferential direction side, it is formed to be 10 mm or more.
  • concentration of strain due to deformation in the tire circumferential direction can be suppressed.
  • the main distortion which acts on the side wear indicator 52 is disperse
  • Other operations are the same as those in the first embodiment, and are therefore omitted.
  • Side wear indicator 72 is opened to tire side part 30 like side wear indicator 26 concerning a 1st embodiment (refer to Drawing 1). Further, as shown in FIG. 5A, the opening edge 72B of the sidewear indicator 72 is formed in an elliptical shape that is slightly longer in the tire circumferential direction. In the present embodiment, the length of the opening edge 72B in the tire circumferential direction is 19 mm, and the length in the tire radial direction is 15 mm (see FIG. 6). Further, the depth is 5.5 mm as in the first embodiment.
  • a straight line in the tire radial direction orthogonal to the center portion P of the opening surface of the sidewear indicator 72 is a reference line XL, from boundary lines DL1 and DL2 inclined by ⁇ 45 degrees around the center portion P from the reference line XL.
  • the curvature radius of the opening edge 72B of the region G on the reference line XL side is larger than the curvature radius of the opening edge 72B located on the tire circumferential direction side and is formed to be 10 mm or more.
  • the opening edge 72B in the tire circumferential direction of the sidewear indicator 72 has a shape in which the opening edge 72B of the region G is connected by a relaxation curve, so that the strain does not concentrate on the part in the specification of the sidewear indicator 72. ing.
  • the bottom 72A of the sidewear indicator 72 is a flat surface. Further, the opening edge 72B of the sidewear indicator 72 is chamfered over the entire circumference.
  • Test 1 The tires of Examples 1 to 3 and the tire 100 of the comparative example were each attached to a rim having a rim width of 7.5 inches, the internal pressure was set to 900 kPa, and a load of 3150 kgf (30.9 kN) was applied to each tire.
  • the main strain acting on the side wear indicator was compared by rolling while adding.
  • a three-dimensional strain measuring instrument VIC-3D manufactured by Correlated Solutions was used.
  • Test 2 The tire 10 of Examples 1 to 3 and the tire 100 of the comparative example were each attached to a rim having a rim width of 7.5 inches, the internal pressure was set to 700 kPa, and the tire was attached to a drum testing machine. In this state, the drum was rotated while applying a load of 3465 kgf (33.98 kN), and after running each tire for 10,000 km, it was visually confirmed whether a crack occurred in the sidewear indicator.
  • the sidewear indicator 52 of the second embodiment is 80 and the main strain acting on the sidewear indicator 72 of the third embodiment is 85, the sidewear is also applied to the second and third embodiments. It was confirmed that the main distortion acting on the indicator can be reduced.
  • Test 3 Tests 1 and 2 were performed on tires with circular sidewear indicators having a radius of curvature of 6 mm, 7.5 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, and 12.5 mm, respectively. The main strain acting on the side wear indicator of the radius of curvature and the presence or absence of cracks were evaluated.
  • the main strain acting on the sidewear indicator 26 of the example was about 10%. From this result, by making the shape of the opening edge 26B of the region A of the side wear indicator 26 in FIG. 3A straight, the distortion is more in the tire circumferential direction than when the opening edge 26B of the region A is formed in a curve. It was confirmed that it could be dispersed.
  • the four sidewear indicators 26 were formed at equal intervals in the tire circumferential direction, it suffices that the sidewear indicators 26 be formed in a number that allows grasping of the wear state of the tire side portion 30 in the tire circumferential direction. For example, three may be formed at equal intervals in the tire circumferential direction.
  • the present invention is not limited to such embodiments, and can be implemented in various modes without departing from the gist of the present invention.
  • the side wear indicator 26 of the first embodiment and the side wear indicator 52 of the second embodiment may be formed on the same tire.
  • the disclosure of Japanese Patent Application No. 2012-025374 is incorporated herein by reference in its entirety. All documents, patent applications, and technical standards mentioned in this specification are as much as if each document, patent application, and technical standard were specifically and individually described to be incorporated by reference. , Incorporated herein by reference.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

La concentration de contraintes au niveau d'un évidement dans une partie de flanc d'un pneu est supprimée. Un pneu (10) présente un évidement (26) formé dans une partie de flanc (22) raccordant une bande de roulement (20) à une partie de talon (12) et indiquant l'état d'usure de la partie de flanc (22). L'évidement (26) est formé dans une partie latérale du pneu (30), le rayon de courbure d'un bord d'ouverture (26B) de l'évidement (26) étant supérieur sur un côté radial du pneu au rayon de courbure du bord d'ouverture (26B) sur un côté circonférentiel du pneu, et au moins égal à 10 mm.
PCT/JP2013/052401 2012-02-08 2013-02-01 Pneumatique WO2013118657A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012025374A JP2013159317A (ja) 2012-02-08 2012-02-08 空気入りタイヤ
JP2012-025374 2012-02-08

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WO2013118657A1 true WO2013118657A1 (fr) 2013-08-15

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016067149A1 (fr) 2014-10-30 2016-05-06 Pirelli Tyre S.P.A. Pneu pour roues de véhicule de type à charge lourde
CN107405966A (zh) * 2015-02-24 2017-11-28 倍耐力轮胎股份公司 用于重载车辆车轮的轮胎
CN112703118A (zh) * 2018-09-12 2021-04-23 大陆轮胎德国有限公司 具有侧壁磨损指示器的轮胎
WO2022208010A1 (fr) 2021-03-31 2022-10-06 Compagnie Generale Des Etablissements Michelin Pneumatique pour bus urbain comprenant un indicateur d'usure de flanc à visibilité améliorée
WO2022208012A1 (fr) 2021-03-31 2022-10-06 Compagnie Generale Des Etablissements Michelin Procédé de détermination de l'état d'usure d'un flanc de pneumatique pour bus urbain

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018180497A1 (fr) * 2017-03-28 2018-10-04 横浜ゴム株式会社 Pneu, moule de pneu, procédé de test de marque gravée de code bidimensionnel et procédé de fabrication de pneu

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6365503U (fr) * 1986-10-17 1988-04-30
JPH04129808A (ja) * 1990-09-21 1992-04-30 Bridgestone Corp 空気入りタイヤ
EP0726173A1 (fr) * 1995-02-07 1996-08-14 Continental Aktiengesellschaft Indicateur d'usure sur les flancs de bandages pneumatiques de véhicules motorisés, en particulier pour poids-lourds et autobus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6365503U (fr) * 1986-10-17 1988-04-30
JPH04129808A (ja) * 1990-09-21 1992-04-30 Bridgestone Corp 空気入りタイヤ
EP0726173A1 (fr) * 1995-02-07 1996-08-14 Continental Aktiengesellschaft Indicateur d'usure sur les flancs de bandages pneumatiques de véhicules motorisés, en particulier pour poids-lourds et autobus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016067149A1 (fr) 2014-10-30 2016-05-06 Pirelli Tyre S.P.A. Pneu pour roues de véhicule de type à charge lourde
CN107405966A (zh) * 2015-02-24 2017-11-28 倍耐力轮胎股份公司 用于重载车辆车轮的轮胎
CN107405966B (zh) * 2015-02-24 2019-08-16 倍耐力轮胎股份公司 用于重载车辆车轮的轮胎
CN112703118A (zh) * 2018-09-12 2021-04-23 大陆轮胎德国有限公司 具有侧壁磨损指示器的轮胎
WO2022208010A1 (fr) 2021-03-31 2022-10-06 Compagnie Generale Des Etablissements Michelin Pneumatique pour bus urbain comprenant un indicateur d'usure de flanc à visibilité améliorée
WO2022208012A1 (fr) 2021-03-31 2022-10-06 Compagnie Generale Des Etablissements Michelin Procédé de détermination de l'état d'usure d'un flanc de pneumatique pour bus urbain
FR3121387A1 (fr) 2021-03-31 2022-10-07 Compagnie Generale Des Etablissements Michelin Procédé de détermination de l’état d’usure d’un flanc de pneumatique pour bus urbain
FR3121388A1 (fr) 2021-03-31 2022-10-07 Compagnie Generale Des Etablissements Michelin Pneumatique pour bus urbain comprenant un indicateur d’usure de flanc à visibilité améliorée

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